Vacuum cleaner



FIG. 1 is an isometric view of a vacuum cleaner showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof, the opposite side being a mirror image;

FIG. 4 is a rear elevation view thereof; and,

FIG. 5 is a top plan view thereof.

The broken lines represent unclaimed portions of the vacuum cleaner and form no part of the claimed design. 

CLAIM The ornamental design for a vacuum cleaner, as shown and described. 